Watts OneFlow OFRES-0835 User manual

Installation, Operation and
Maintenance Manual
Residential OneFlow®Anti-Scale System
Chemical-Free, Salt-Free Scale Prevention
Model OFRES-0835
Model OFRES-0935
Model OFRES-1035
Introduction
The Watts residential OneFlow®system provides protec-
tion from hardness related scale formation throughout the
plumbing system. The OneFlow®system can be installed at
the point of entry to treat your entire home. These systems
are designed to treat the domestic water used in a single
family dwelling. For higher volume applications please con-
tact your Watts representative.
OneFlow®reduces or eliminates scale formation on internal
plumbing surfaces.
OneFlow®prevents scale by transforming the normal dis-
solved hardness minerals into undissolved crystal micro-
particles. These crystals stay suspended in the water and
have a reduced ability to react and attach to surfaces like
dissolved hardness minerals do. Therefore, the problem of
internal buildup of scale in pipes, water heaters and plumb-
ing fixtures is greatly reduced.
Unlike softened water, OneFlow®treated water maintains the
beneficial essential mineral content of your water.
• Use only lead-free solder and flux for sweat-solder connections,
as required by state, province and federal codes.
• Handle all components of the system with care. Do not drop,
drag or turn components upside down.
• Be sure the floor under the system is clean, level and strong
enough to support the unit.
• Install the system in a protected area.
• Do not attempt to treat water over 100°F (38°C) with the system.
• Always connect the system to the main water supply pipe before
the water heater.
• Do not expose the system to freezing temperatures. Water freez-
ing in the system causes equipment damage.
• Do not install in direct sunlight. Ultraviolet rays from the sun may
cause damage.
IOM-OFRES
OFRES
If you are unsure about installing your Watts OneFlow®system
contact a Watts representative or consult a professional plumber.
You are required to thoroughly read all installation instructions and
product safety information before beginning the installation of this
product. FAILURE TO COMPLY WITH PROPER INSTALLA-
TION AND MAINTENANCE INSTRUCITONS COULD RESULT
IN PRODUCT FAILURE WHICH CAN CAUSE PROPERTY
DAMAGE, PERSONAL INJURY AND/OR DEATH. Watts is not
responsible for damages resulting from improper installation and/or
maintenance. Local building or plumbing codes may require modi-
fications to the information provided. You are required to consult
the local building and plumbing codes prior to installation. If this
information is not consistent with local building or plumbing codes,
the local codes should be followed.
Save manual for future reference.
Refer to the enclosed for operating parameters to ensure proper
use with your water supply.
Table of Contents Pages
Introduction .........................................1
Instructions Before Using...............................1
OneFlow®Benefits....................................2
System Overview.....................................2
Equipment Specifications ..............................3
Using OneFlow®with Other Equipment ....................3
Important Note- Iron, Manganese, Copper .................4
Cautions ...........................................4
Notes to the Installer ..................................4
Installation and Start Up................................5
Bypass Valve Modification ..............................5
Note to the Home Owner ..............................6
Limited Warranty .....................................7
WARNING
!
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information
can result in death, serious personal injury, property
damage, or damage to the equipment.
Keep this Manual for future reference.

2
CK-V3007
1" PVC Male NPT Elbow
Assy.
(EDP#0002169)
OneFlow®Benefits
• Chemical free scale prevention. Provides cost savings and
environmental benefits
• Virtually maintenance free. No salt bags or other chemicals
to buy, transport and store
• No electricity, no wastewater, completely self-contained
• Beneficial minerals retained for more healthful drinking
water
• Improves the efficiency of water-using appliances
• Simple installation – no electrical and drain hookup
• Compatible with all on-site and community wastewater
treatment systems
• Not subject to water softener restrictions and “bans”
Tank Head
Media Tank
System Overview
CK-V3006
Bypass Assy.
(EDP#0002167)
Bypass Valve and Connection Fittings
Setup
Unpack and check the system components for damage or miss-
ing parts.
Installation Considerations
Consider the following points when determining where to install
the system:
• Do not install the system where it would block access to the
water heater, main water shutoff, water meter, or electrical
panels.
• Install the system in a place where water damage is least likely
to occur if a leak develops.
Figure 1.

3
Equipment Specifications
Watts OneFlow®systems are complete, self-contained, loaded
with media and ready to use. A simple inlet and outlet connec-
tion is all that is required for installation. Please review operat-
ing pressures, temperatures and water chemistry limitations to
ensure compatibility and performance.
**Copper
Pursuant to the EPA drinking water standards, the copper con-
centration permitted is up to 1.3 ppm. Typically originating from
new copper plumbing, high levels of copper can foul OneFlow
media. For applications with copper concentration greater than
1.3 ppm, please contact Watts Pure Water Technical Service at
1-800-224-1299. To further minimize any problem with excess
copper, avoid applying excessive flux on the inner surfaces
of the pipe and use a low-corrosivity water soluble flux listed
under the ASTM B813 standard.
NOTICE
***Silica
OneFlow®media does not reduce silica scaling. While silica tends
to have a less significant effect on scale formation than other
minerals, it can act as a binder that makes water spots and scale
residue outside the plumbing system difficult to remove. This 20
ppm limitation is for aesthetic purposes.
a b
c
Mechanical Specifications
Model 835 935 1035
Max Service Flow
(gpm)
8 12 16
Dry Weight (lbs) 19 23 25
a 40 40 40
b 37 37 37
c 12 12.5 13
Using OneFlow®with other water treatment
chemicals
The addition of soaps, chemicals, or cleaners, before or after
OneFlow treatment, may reverse its anti-scale treatment effects
and/or create water with a heavy residue or spotting potential.
Any adverse conditions caused by the addition of soaps, chemi-
cals, or cleaners are the sole responsibility of the end user.
Figure 2.
pH 6.5-8.5
Hardness (maximum) 25 grains (427 ppm CaCO3)
Water Pressure 15 psi to 100 psi (1.03 bar to 6.9 bar)
Temperature 40° F to 100° F (5°C to 38°C)
Free Chlorine <2 ppm
Iron (maximum) 0.3 ppm
Manganese (maximum) 0.05 ppm
Copper 1.3 ppm*
Oil & H2S Must be Removed Prior to OneFlow
Silca (maximum) 20 ppm**
* See note about iron, manganese and copper on the next
page.
** These systems prevent hardness related scale formation inside
the plumbing system of the home at influent hardness levels of
25 grains per gallon of calcium carbonate and less. Due to vari-
ances in water chemistry certain aesthetic conditions external
of the plumbing system may not be attained.
WARNING
!
NOTICE
Pressure drop at peak flow rate is less than 5 psi.
Pressure drop reading taken with inlet and outlet gauges installed
at a common elevation and 80 degree feed water.
Dimensions (nominal - inches)
Feed Water Chemistry Requirements

4
Cautions!
•Not for use on closed loop systems.
•Do not let the system freeze. Damage to the tank may result.
•System must be operated in a vertical position. Do not lay
it down during operation. The system may be placed in any
position for shipping and installation but must be operated in
the vertical position.
•Place the system on a smooth, level surface. Because the
system operates in an UP-Flow, fluidized bed mode, hav-
ing a level surface is more important than with a softener or
media filter.
•A bypass valve should be installed on every system to facili-
tate installation and service.
•Observe all local plumbing and building codes when install-
ing the system.
•Water known to have heavy loads of dirt and debris should
be prefiltered using a 20 micron filter cartridge model
number PWPL10FFM20 and 1" high flow filter housing kit
PWHIB10FF.
•If making a soldered copper installation, do all sweat solder-
ing before connecting pipes to the bypass valve. Torch heat
will damage plastic parts.
•When turning threaded pipe fittings onto plastic fittings, use
care not to cross-thread.
• Use PTFE tape on all external pipe threads. Do not use pipe
joint compound.
•Support inlet and outlet plumbing in some manner (use pipe
hangers) to keep the weight off of the bypass fittings.
•Do not use on water that is microbiologically unsafe or of
unknown quality.
Notes to the Installer
The OneFlow®system differs from a conventional softener or
media filter in a number of key respects.
•The system is light and only partially filled with media. This is
normal. The UP-flow operation of the system requires a lot of
freeboard to allow the bed to fully fluidize.
•The system has no underbed so you can tip the system
over without any fear of upsetting the media. This makes
transportation and installation much easier than conventional
systems. Must be installed in VERTICAL POSITION.
•Because the OneFlow®system operates in the UP-flow
mode, the tank connections are opposite of traditional instal-
lations. Please follow water flow diagram illustrated in Figure
3.
•Please see the “Important note about iron, manganese and
copper in the water supply” section.
•Please see the note about “Using OneFlow®with other water
treatment equipment” on the previous page.
•This system is designed for residential applications only.
•This system comes with a bypass valve to bypass the sys-
tem in case of a leak or the need to remove the system from
the installation area. The nuts, locking rings, and O-rings
must be installed on the connection fittings by the installer.
Please see Figure 1 Bypass Valve and Connection Fittings
detail for proper assembly of the #CK-V3007. To properly
assemble the connection fitting first install the nut, then
install the locking ring in the grove closest to the nut. Use
care not to break the locking ring. Finally install the O-ring in
the grove at the end of the fitting.
NOTICE
CAUTION
!
Iron and Manganese
NOTICE
*Iron and Manganese
Just as with conventional water softening media, OneFlow®
media needs to be protected from excess levels of certain metals
that can easily coat the active surface, reducing its effectiveness
over time. Public water supplies rarely, if ever, present a problem,
but if the water supply is from a private well, confirm that the levels
of iron (Fe) and manganese (Mn) are less than 0.3 mg/L and 0.05
mg/L, respectively.
Important notice about iron, manganese and copper in the
water supply
NOTICE Copper
Pursuant to the EPA drinking water standards, the copper con-
centration permitted is up to 1.3 ppm. Typically originating from
new copper plumbing, high levels of copper can foul OneFlow
media. For applications with copper concentration greater than
1.3 ppm, please consult Watts Water Quality Technical Service.
To further minimize any problem with excess copper, avoid ap-
plying excessive flux on the inner surfaces of the pipe and use
a low-corrosivity water soluble flux listed under the ASTM B813
standard.

5
Installation and Start-up
1. Turn off water heater(s).
2. Turn off the main water supply to the home and open an
inside faucet to relieve any pressure within the plumbing sys-
tem.
3. Place the system in the desired location. Make sure that the
location is level and sturdy enough to support the weight of
the wetted system.
4. Place the bypass valve in the up flow service position. See
below Bypass Valve Modification Detail.
5. Connect the cold water supply to the inlet of the OneFlow®
system. NOTE: The OneFlow®system operates in the
UP-flow mode which is opposite of a conventional softener.
Follow the plumbing diagram in Figure 3.
6. Install a supply valve (user supplied) in the supply line and
close it.
7. Place a bucket under the outlet port or run a line from the
outlet port to a drain.
8. Turn the water back on to the house. Slowly open the sup-
ply valve to the OneFlow®system. Allow the tank to fill with
water. Close the supply valve when a steady stream of
water comes out of the outlet port. If the outlet is flowing
into a bucket, water could splash on nearby objects. If this
threatens the safety, value, structure, or appearance of these
objects, protect/remove them or use the outlet hose to drain
option.
9. Close the inside faucet.
10. Connect the outlet of the OneFlow®system to the cold
water supply to the house.
11. Open the supply valve to the OneFlow®system.
12. Open hot and cold faucets downstream from the OneFlow®
system to relieve any air from the plumbing system and
water heaters. Then close the faucets.
13. Check for leaks. Repair as needed.
14. The system is now ready for service.
IN
Cold Water
OUT
OneFlow®Treated Water
Figure 3.
OFRES shown with bypass as-
sembly.
Service Position
down-flow tank. As shipped, the bypass is set-up for down-
flow use. The arrow shape of the handles
points in the wrong direction for UP-flow
use. To convert it to UP-flow use, pull up on
the red handles until they come off. Rotate
the handle 180° and put it back on the valve
stem.
Service Position
UP-flow tank.
Bypass Position
UP-flow tank.
Bypass Valve Modification

6
Note To The Home Owner
Your OneFlow®system will improve the properties of water
throughout your home. Here are some things to expect and
some recommendations for maximizing the benefits and your
enjoyment of OneFlow®
Sinks and fixtures - should
have reduced spotting. If water
is allowed to evaporate off a
surface, small spots may be left
behind. Many times this residue
is easier to clean up than the
previous hard water spotting.
Dishwasher-Spotting on
dishes and on the surface of
the dishwasher should be greatly reduced. We recommend
that you immediately reduce the
amount of dishwashing deter-
gent by approximately 50% as
compared to hard water use.
Dishwashing detergents low in
phosphates are highly recom-
mended as they are better for
the environment and phos-
phates can cause spotting. In
very hard water areas, the use of a
rinse aid may be advised.
Shower doors and tiles- should
have reduced spotting. When water
evaporates off a surface, small spots
may be left behind. Depending on
water chemistry, these spots may be
easy to remove with a damp
cloth or sponge.
In the bath you should notice
that soaps and shampoos
lather more than with un-
treated water. Soaps and
shampoos will also rinse off
much easier and faster than
they would with traditional soft
water. We recommend the
use of modern soaps for the
best results.
Residential OneFlow®Media
Replacement
The Watts OneFlow®media has an average life span in ex-
cess of 3 years depending on water volume and specific water
chemistry. If you notice a change in performance after a three
year period and feel the media should be replaced contact your
system installer, professional plumber, or water treatment expert
to perform a re-bed service. The color of the media should be
noted any time it is replaced to ensure the media has not be-
come fouled. If it has, additional pretreatment for the system may
be necessary.
Replacement Media
OFRES-0835RM Media should be replaced every 3 years
OFRES-0935RM Media should be replaced every 3 years
OFRES-1035RM Media should be replaced every 3 years
Things to watch for:
During the first 30-90 days:
• Faucet aerators and drains may plug occasionally as old scale
is removed from your plumbing system and water heater.
• You may also see milky water while the descaling is taking
place. This is simply an increase in the calcium in the water be-
cause OneFlow®is removing old scale deposits from your pipes.
Good practices:
If your dishwasher is severely coated with scale at the time of
installation, we recommend that you purchase a product like Jet-
Dry®Dishwasher cleaner to accelerate the cleaning. After this
initial cleaning OneFlow®should keep it clean.
We also recommend that you drain your water heater tank. This
should be done 30 to 60 days after OneFlow®is installed, and
again in one year. This is a good practice that can dramatically
increase the life of your water heating appliance. The OneFlow®
will help keep the tank and heating elements free of scale and
operating at peak efficiency. Please follow the manufacturer's
instructions when draining the tank!
Jet-Dry® is a registered trademark of Ecolab, Inc.

7

Limited Warranty
• The OneFlow®tank system is warranted to be free of defects in materials and workmanship for 5 years from the date of original shipment.
• The OneFlow®media is warranted for performance for a period of 2 years from the date of the original installation when installed and
operated in accordance with the instructions in the corresponding Installation and Operation Manual.
Conditions
1. OFRES Series systems are warranted for domestic use in residential single family dwelling applications excluding irrigation water treatment.
The use of these systems in light commercial, commercial, or industrial applications will void their limited warranty.
2. The OneFlow®system must be installed in applications with municipally supplied water adhering to EPA guidelines.
3. Any component failure must not result from abuse, fire, freezing or other acts of nature, violence, or improper installation.
4. Equipment must be installed and operated in compliance with the local plumbing codes and on an approved water supply.
5. Equipment is limited to use at water pressures and temperatures that do not exceed our published specifications.
6. Water supply must not exceed 2.0 PPM chlorine. For water supply exceeding 2.0 PPM chlorine, pretreatment is required.
(Please contact your water treatment specialist.)
7. Information, including model number, serial number, and date of installation, must be provided for any claims pertaining to equipment
in warranty.
8. Defective parts are subject to inspection by either Watts Regulator Company or any authorized representative before final commitment
of warranty adjustment is made.
9. Watts Regulator Company reserves the right to make changes or substitutions in parts or equipment with material of equal quality or value
and of then current production.
Limitations
Our obligation under this warranty with respect to the tank or valve is limited to furnishing a replacement for, or at our option, repairing any
part or parts to our satisfaction that prove defective within the warranty period stated above. Such replacement parts will be delivered to the
owner F.O.B. nearest factory, at no cost, excluding freight and local labor charges, if any.
Our obligation under this warranty with respect to the OneFlow®media will be limited to furnishing a replacement for the media within two
years from date of original installation. Such replacement media will be delivered to the owner F.O.B. nearest factory, at no cost, excluding
freight and local labor charges, if any. Damage to the media due to chlorine, other oxidizers or fouling caused by local water conditions or
any other operation outside of the limits shown under Specifications, is not covered by this warranty.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY WATTS REGULATOR COMPANY
WITH RESPECT TO THE PRODUCT. WATTS REGULATOR COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. WATTS
REGULATOR COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described under this warranty shall constitute the sole and exclusive remedy for breach of warranty, and Watts Regulator
Company shall not be responsible for any incidental, special or consequential damages, including without limitation, freight, handling, lost
profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from
labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any
other circumstances over which Watts Regulator Company has no control. This warranty shall be invalidated by any abuse, misuse, misap-
plication or improper installation of the product.
Some states do not allow limitations on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of inci-
dental or consequential damages. Therefore the above limitations may not apply to you. This warranty gives you specific legal rights, and
you may have other rights that vary from state to state. You should consult applicable state laws to determine your rights. SO FAR AS IS
CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO THE APPLICABLE
WARRANTY PERIODS STATED ABOVE.
WARNING: This product contains chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm.
For more information: www.watts.com/prop65
IOM-OFRES 1734 EDP# 2915920 © 2017 Watts
USA: T: [phone] • F: [phone] • Watts.com
Canada: T: [phone] • F: [phone] • Watts.ca
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